Trimming mechanism for sewing-machines.



J. P. WEIS.

TBIMMI'NG MECHANISM FOR SEWING MACHINES.

' APPLICATION FILED JAN.29, 1910.

1 ,05 9,795, V Patented Apr. 22, 1913.

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J. P. WEIS.

TRIMMING MECHANISM FOR SEWING MACHINES.

APPLIGATION IILEI) JAN. 29, 1910.

1,059,795. I Patented Apr. 22, 1913.

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ATTORNEY.

JOHN P. WEIS, 0F NYACK, NEW YORK.

TRIMMING MECHANISM FOR SEWINGJVIACHINES.

Specification of Letters Patent.

Original application filed October 11, 1909, Serial No. 522,158.

Patented Apr. 22, 1913.

Divided and this application filed January 29, 1910. Serial No. 540,762.

T 0 all whom it may concern Be it known that 1, JOHN P. 'VVnIs, a citizen of the United States, residing in Nyack, county of Rockland, and State of New York, have invented a new and useful Improvement in Trimming Mechanism for Sewing-Machines, of which the following is a description.

This invention relates to sewing machines, and particularly to trimming mechanism therefor.

Among the objects of my invention may be noted the following: to provide a trimming attachment for sewing machines which will be simple, compact, steady in operation, strong and durable; to provide a trimming attachment so constructed as to be capable of location and operation at the extreme end of the cloth-plate of the machine; to provide a trimming attachment with a simple adjusting means by which the trimmer-lever may be quickly and readily set in operative relation with reference to the stitching position; to provide means by which the trimmer-blade can be readily and quickly set in proper position and braced when so set; and to provide a simple and compact structure by means of which the ledger-blade of the trimming mechanism may be quickly and readily set in proper position for cooperation with the trimmerblade and firmly held in said position.

With the above objects in View, and others which will be detailed during the course of this description, my invention consists in the parts, features and elements, and combinations of elements as hereinafter described and claimed.

In order that my invention may be clearly understood, I have provided drawings wherein:

Figure 1 is a top plan View of one end of a sewing machine, showing suflicient thereof to illustrate the mode of attachment of the trimming mechanism, parts being broken away and certain parts being shown in section; Fig. 2 is a front elevation of the parts shown in Fig. 1 but with the trimmer-lever shown intact and a bearing of the machine-head also shown; Fig. 3 is an end elevation of Fig. 2; Fig. 4 is a side elevation of the parts shown in Fig. 2, but with the head of the machine omitted; Fig. 5 is a perspective view showing the trimmer-blade holder and binding nut separated; Fig. 6

is a plan of the head of the trimmer-lever; Fig. 7 is a horizontal section showing the ledger-blade support and adjusting means; Fig. 8 is a sectional detail of the trimmer support and actuating means, and showing also the feed-actuating eccentric. Fig. 9 is a side elevation of the trimmer-lever and Fig. 10 is a sectional detail of the trimmerlever, journal, bearings and screw.

Referring to the drawings, the numeral 1 indicates the bed-plate of the sewing machine to which the trimming attachment is applied, said machine being of a wellknown Metropolitan type and particularly of the type shown in,my application Serial No. 522,158, filed October 11, 1909, of which this case is a division.

The numeral 2 indicates the lower bearing of the head of the machine in which the needle-bar 3 reciprocates, and in which also the presser-bar 4 operates, said prcsserbar being provided at its lower end with the usual shank 5, carrying the presser-foot 6, which may be of the construction shown in my aforesaid application. The numeral 7 indicates a thread-cutter secured to or form-" ing part of the shank of the presser-foot, and the numeral 8 indicates generally the several parts of the feeding mechanism which latter is the same as that of my aforesaid application. The cover-plate of the machine is indicated by 9, the driving-shaft by 10 supported near its forward end in the bearing 11, secured to a bearing-plate 12, supported in any suitable manner on the bed-plate 1 of the machine, 13 is the wo'rlcsupport, 14 is the throat-plate through which the feeddog operates, 15 is the laterally projecting horn forming part of the work-support in which the ledger-blade and adjusting means are supported; and 16 is a work-guide secured to the forward end of the throatplate or a portion of the work-support. The work-support 13 is at one side sup orted on the standard 17 as indicated in Fig. 4c, a screw 18 passing through said work-support and into said standard. At its other side the work-support 13 is formed integral wit-l1 or is at rest upon the upper edge of the end-plate 19, which, at its lower end, is rigidly secured to the end of the bed-plate 1, by means of screws 20 extending into said bed-plate through the end-plate near its bottom. At its upper edge the end-plate 19 is provided with the bearing 21, and on its opposite edge said top-plate is provided with the bearing 22, the intervening space being formed into an opening 23 in which the trimmer-lever 24 operates.

The trimmer-lever 24 is provided with the hub 25, through which extends the journalpin 26, supported in the opposite bearings 21 and 22 of said top-plate 13, said lever being secured to said pin 26 by screw 27, and being free to move laterally with said journal-pin but held in adjusted position by means of the screw-threaded bushing 28, sleeved upon said pin 26 and working in the adjacent bearing 22 of the top-plate, said bushing being provided with the knurled head 29, which engages the hub 25 of the trimmerlever. The bushing 28 has screwed upon its outer end the binding nut 30, which engages the side of the adjacent bearing 22 of the top-plate 13, to limit and hold the adjustment of the bushing, and consequently, hold the trimmer-lever and bushing from lateral movement. To enable control of the adj ustment of the trimmer-lever in opposite directions to be maintained, a head 31 is provided on the inner end of the journal-pin 26, said head being in the form of a screw threaded into the end of said pin. This head 31, hearing against the end of the bushing 28, holds the pin 26 from longitudinal movement in the bushing because of the hub 25 of the trimmer-lever being in engagement with the other end of the bushing, and being fixed to the pin by screw 27. Hence, adjustments of the trimmer-lever 24 can be made and maintained, in one direction to regulate the pressure of the trimmer-blade against the ledger-blade and in the opposite direction to regulate the width of trim or width of seam, the said head 31 operating as a stop and enabling the trimmer-lever to be readily shifted. The trimmer-lever, at the forward end of its overhanging arm 32, is formed with a grooved-head 33, in which is set the trimmer-blade 34, for longitudinal adjustment, said blade being carried in the grooved-head 35 of a bolt 36, said bolt-head having the flanges 37, which engage said trimmer-blade and clamp the same tightly to the grooved-head 33 of the arm 32, the bolt-head resting in a socket 38 of the lEWGI- head 33 and being adjusted and held in place by the nut 39 threaded on the rear end of said bolt, see Fig. 5. The lower arm of the trimmer-lever is bifurcated at 40 and between the forks thereof a block 41 operates, the same being actuated by the eccentric 42, carried by the driving-shaft 10. To prevent the trimmer-blade 34 from being displaced by accident or undue pressure or strain thereon, the head 33 is provided with the depending portion 43, see Figs. 2, 4 and 9, which is quite broad and has the laterally extending flange 44, cotiperating with the depending finger 45, for guiding the trimpinging against the said sleeve.

being pushed rearwardly too far back or broken off under any circumstances, thus insuring the proper sliding engagement of the cutting-edge 46 with the cutting edge 48 of the ledger-blade 47, which latter is supported by the block 49, which is grooved at 50 to receive said blade, as shown in Fig. 7. Adjacent said groove 50 is a wider groove, which receives the head 51 of an internally screw-threaded sleeve 52, which slides freely in the horn-shaped extension 15 of the frontend plate portion 19 of the machine, said sleeve being held in place by means of the screw 53, screwing into said horn and im- By this means, the block or holder 49 is firmly held against the horn 15 and the ledger-blade 47 is given its general location in the machine. Vertical adjustments of the ledger-blade 47 are secured by means of the screw 54, passing through the horn 15, and threaded into the sleeve 52, and at its forward end impinging against the ledger-blade 47, so as to press and bind the same tightly against the fiat wall of the groove 50 of the block or holder 49. The trimmer-blades operate in advance of the stitch-forming mechanism and perform the function of trimming the edges of the work in advance of the overedge stitching, which latter binds the trimmed edge as the work is fed through the machine. Located in advance of the trimming mechanism and coiiperating with the ledger-blade thereof is the adjustable work-guide and work'retainer 16, shown in Figs. 1, 2 and 4, and said device having the attaching-plate 55, through a slot in which pass the binding-screws 56, screwed into the depending portion 57 of the throat-plate. 5 The workguide has its rearwardly extending portion in line with the line of feed and tapered to a point, as at 58, it being understood that, in the operation of the machine, the guide leads the fabric, directly to the trimmer-blades and under the presser foot,

the trimmer trimming the edge of the work and thus preparing the same for the binding stitches of the overedge-stitching mechanism. The plate can be adjusted laterally by means of the slotancl screws 56 so as to regulate the amount of trimming the work is to have preparatory to the stitching. The adjustment of the guide may also be such as to enable blind-stitching to be produced, since the position of the guide-portion 16 will determine whether the needle shall penetrate the several pieces of work fro-m side-to-side or merely pass through the top-pieces and into one side and out of the same side at the fold of the lower piece of work. The overhanging portion of the guide holds the fold of the work down upon the work-plate and prevents the edge thereof fro-m springing out of position, or being improperly trimmed by the trimming mechanism.

The work-plate 14 is held in position on the end-plate 19 of the machine by means of the screws 59, and this work-plate sup plements the horn 15 in supporting the.

work, said plate 14 being provided with a plurality of elongated slots through which the serrated feeding surface S of the feeddog operate and also being provided with an open sided slot 60 for the operation of the needle and for the free movement of the spreader and for the free movement of the threads of the stitch. It will be noted that this work-plate is not extensive and that it projects laterally beyond the front end of the machine and over the farther extending horn 15. Hence, there is clearance all around the said plate and horn, which gives freedom of movement for manipulating the work and enables tubular articles to be freely fed and extended up to the feed and stitching position. Also it is to be noted that the mode of supporting the trimmer-lever and the ledger-blade is such, in combination with the structure of the trimming mechanism as a whole, as to enable a very close relationship to be established between it and the stitch-forming mechanism and feeding mechanism at the extreme end of the machine, all of which aid in the production of my improved machine and make the same practical for the special purposes pointed out.

From the foregoin description the mode of operation will be readily understood and it will be seen that the driving-shaft 10 in its rotation will actuate the eccentric 4:2 which, in turn, will reciprocate the block 41 in the lower bifurcated end of the trimmerlever which. will thus be caused to vibrate upon its fulcrum and cause its upper end to give to the trimmer-blade carried thereby a reciprocating motion which will result in causing the inclined cutting-edge of said blade to move relatively to the ledger-blade with a shearing action.

The adjustment of the trimmer-blade relatively to the ledger blade is produced by first releasing the journal pin 26 in the bushing 28, this being accomplished by shifting the screw 31. The screw 27 securing the trimmer-lever to the pin 26 is then released. The trimmer-lever may now be set over so as to snugly cooperate with the ledger-blade, whereupon the screw 27 is tightened upon longitudinally in the bearing 22, due 'to vi brations of the trimmer-lever in operation. Bodily movement of the trimmer-blade, corresponding to bodily movements of the ledger-blade, may be provided for by loosening the nut 30 upon the bushing 28 so that the latter may be shifted one way or the other to bodily shift the trimmer-lever. lVhereupon the nut is then again set against the bearing 22 to hold the bushing from longitudinal movement in the latter. Vertically or relatively to the lever head, the trimmer-blade may be adjusted by loosening the nut 39 so that the blade may be moved in the holder to the extent desired, and the nut reset to hold the adjustment made. The ledger-blade can be adjusted by loosening the screw 54, which will enable said blade to be moved vertically, the screw being then reset to hold the adjustment. The ledgerblade holder is set in place and held by the headed sleeve, which in turn is set in position by the screw.

From the foregoing it will be seen that a very simple and compact mechanism has been produced which is positive in all its operations and the trimming action of the blade of which is given with an eccentric of small pitch. It will also be seen that the mechanism is very strong andv cannot rattle or work loose, and that said mechanism is readily assembled in the machine.

The construction of the trimming mechanism is also such that it can be applied to the extreme end of the work-plate of the machine or can be located in any other part of the machine and, in consequence, is capable of adaptation to practically any class or type of machine.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

l. A trimming mechanism comprising a trimmer-blade and a ledger-blade; means for supporting the trimmer-blade including a carrier provided with a head having a transverse groove for the reception of the trimmer-blade and also surrounding said groove and extending rearwardly thereof into the head; a circular socket, terminating in a smooth bore extending .to the back of the carrier; a blade clamp having a smooth shank and screw-threaded rear end and an enlarged circular head provided with a transverse groove with overhanging lips, the said groove being for the reception of the trimmer-blade and the said head cooperating with the socket in the carrier,

tubular bearing, a sleeve set in said bearing,

a head carried by the sleeve, a carrier provided with a groove cooperating with the head, and means for adjustably securing the ledger-blade in the carrier.

3. In combination with the work-support of a machine provided with an opening, a trimming mechanism having a lever operating in said opening with a portion below and a portion above said work-support, bearings carried by said work-support, a journal-pin for the lever secured in said bearings, means for securing the lever to the journal-pin, and means for adjusting the journal-pin in the bearings.

4. A trimming mechanism comprising a trimmer-lever, a support therefor midway between its ends, a trimmer-blade supported at an angle to one end of the trimmer-lever, said lever having its other end bifurcated, a driving-shaft, an eccentric fixed thereto, a block surrounding the eccentric and cooperating with the arms of the bifurcation of the lever and sliding freely between the same.

5. A trimming mechanism comprising a movable trimmer-blade and a stationary ledger-blade, a block in which the ledgerblade is set, a headed pin having a screwward end engaging with the ledger-blade to clamp the same against the block.

6. A trimming mechanism for sewing machines comprising a supporting-plate provided with an opening and having journalbearings on opposite sides of said opening, a journal-pin, having a screwthreaded bore in one end thereof, supported in said bearings and tree to rock and slide longitudinally in said bearings, a trimmer-lever fixed to said pin, a screw-threaded bushing interposed between said pin and one of said bearings, said bushing having a head by means of which it may be turned in the bearing, a binding-nut at one end of said bushing and a stop-screw cooperating with the screwthreaded bore in the end of said pin and having its head cooperating with the bushing.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

JOHN P. VEIS. lVitnesses JOHN KANE, EDWARD L. RUssELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

